Lock-seam.



Nu 663,386. Patented vDecfff, |900;

G. P. Hoses.

LUCK SEAM.

(Application led Mar, 15, 1900.1

(N 0 M 0 d el.)

LUI/Nita *raras GEORGE P. HOBBS, OF NEV ORLEANS, LOUISIANA, ASSIGNOR OF ONE-HALF TO THE H. HALLER MANUFACTURING COMPANY, LIMITED, OF

PLACE.

SAME

LOCK-SEAIVI.

SPECIFCATION forming part of Letters Patent N o. 663,386, dated December 4, 1.900.

Application filed March l5, 1900. Serial No. 8,831. (No model.)

T0 all 7.071.077?, zit rim/y con/cern:

Y3e it known that I, GEORGE P. HOBBS, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented new and useful Improvements in Lock-Scams, of which the following is a specification.

My invention relates to improvements in lock seams for connecting the contiguous edges of sheet-metal stovepipes and other tu'- bular and angular articles, as well as the adjacent edges of sheet-metal plates and other sectional fiat work.

It has for its general object to provide a simple and compact lock-seam entailing the employment ot' no more metal than an ordinary joint and one which is susceptible of being easily made and closed and vet is calculated to securely lock the edges of a piece of sheet metal forming a stovepipe or other article or the adjacent edges of two sections of sheet metal together throughout the length thereof, so as to permit of such article or connected sections being cut at intervals in their length without impairing the seam.

Theinvention will be fully understood from the following description and claims when taken in conjunction with the accompanying drawings, in which- Figure l is a front elevation illustrating two portions of sheet metal connected in accordance with my invention. Fig. 2 is a transverse section taken in the plane indicated by the broken line 2 2 of Fig. l. Fig. 2n isasection taken on line 212 of Fig. l. Fig. 3 comprises disconnected perspective views of the two members of the seam. Fig. 4. comprises disconnected perspective views of the members as they appear precedent to bending them so as to provide the one with an outturned edge and the other with an inturned edge.

Referring by letter to said drawings, A B are t-he members of my improved lock-seam, the said members being the adjacent portions ot' a single piece of sheet metal shaped to form a stovepipe or other article or the adjacent portions of two plates or sections of sheet metal to be connected as desired. The member A is bent laterally7 to a slight extent at a andis provided with a longitudinal outturned edge l). It is also provided on the inner side of its portion c below the edge b with protuberances or buttons d, formed by pressing the sheet metal, and in its said edge l) has apertures e, the said apertures alternating with or being arranged intermediateof the protuberances or buttons throughout the length ot' the member, as shown. The member B is bent slightly in a lateral direction atfand is provided with an inturned edge g of about the same width as the edge b of member A. Said member is further provided on the inner side of its portion 7L opposite the edge g with protuberances or buttons t', formed by pressing the sheet metal, and in the said edge g has apertures y', which alternate with or are arranged intermediate of the protuberances or buttons, as shown. Y

The buttons d and apertures e of the member A and the buttons@ and aperturesjof the member B are so arranged that when the outturned and inturned edges l1, g of said members are interlocked after the manner shown in Fig. l each of the buttons d of member A will register with or rest opposite one aperturej of the member B, and each of the buttons t' of member B will register with or rest in line with one aperture e of the member A. From this it follows that when the seam is closed bypounding it with a mallet or subjecting it to pressure the buttons d of member A will be forced into the apertures j of the member B, and the buttons of said member B, in turn, will be forced into the apertures e of member A, with the result that the outturned and inturned edges b g will be securely locked against both longitudinal and lateral movement with respect to each other, and a strong, durable, and perfectly tight lock-seam formed.

It will be observed from the following that the members of my improved seam may be made very easily and cheaply and that the same may be expeditiously closed, and it will also be observed that the seam is as tight and strong as those which entail the employment of rivets.

It will further be observed that the seam is adapted to be used to advantage in stovethat the said bends a f form no part of my' improvements and are not essential to my improved lock-seam and that when desired they may be omitted Without in any Way affecting the eiciency of the seam.

I-Iaving thus described my invention, what I 'claim' isl. In the lock-seam described, the combination of a sheet-metal member having an outturned edge provided with perforations, and also having protuberances on its main portieri opposite the outturned edge, at points out of alinement with its apertures, and extending toward said edge, and a second sheetmetal member having an inturned edge provided With perforations, and also having protuberances on its main portion opposite the 1 inturned edge, at points out of alinement with its perforations, and extending toward said inturned edge; the said edges of the members being each interposed between the edge portion and main portion of the other member and brought transversely together, whereby the protuberances on the main portion of each member are secured in the apertu res in the turned edge of the other, substantially as and for the purpose set forth.

2. In a lock-seam, the combination of a sheetmetal member -having an outturned edge, and a second sheet-metal member having an intured edge interlocked with the outturned edge of the rst-named member; the said members also having protuberances and complementary apertures therefor in their main portions and turned edges which protuberances are arranged to enter and occupy the apertures when the interlocked edges are subjected to pressure, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

GEORGE P. IIOBBS.

Witnesses:

GEO. G. FRIEDRIeHs, CHAs. GAIN. 

